Teaching at its most literal level educating, imparting knowledge is the most fundamental part of a teacher's job. It is more obvious than (though just as important as) inspiring, motivating and forming relationships.
A teacher (also called a school teacher) or educator is a person who provides education for students.
The role of teacher is often formal and ongoing, carried out at a school or other place of formal education. In many countries, a person who wishes to become a teacher must first obtain specified professional qualifications or credentials from a university or college. These professional qualifications may include the study of pedagogy, the science of teaching.